Impress Addons Site

I don't know that it would increase the number of messages - something in your inbox is something in someone else's oubox. We would have to decide how each would be managed - if I delete a message in my outbox, would it also remove it from the recipient's inbox? What about the other way around. This could be extended to also 'recalling' a message, where the sender could remove messages from the inboxes of recipients that have not read the message.